Improvement in saw-filing machines



' ZSheets--Sheetl F. W. BENIAMIN.'

saw-Filing Manning. K

No. 159,631- Paxemed Feb.9,17.5.

Figi.

UNITED STATES FRED. W. BENJAMIN, OF JEFFERSON, ASSIGNOR OF ONE-HALF HISRIGHT PATENT QEETGE.

TO ABRAM SHEARS, OF SHEFFIELD, OHIO.

IMPROVEMENT IN SAW-FILING MACHINES.

Specification forming part of Letters Patent No. 159,631, dated FebruaryQ, 1875; application filed Jiny 2o, 1874.

To all whom it may concern:

Be it known that I, F. W. BENJAMIN, of Jeiferson, in the county ofAshtabula and State of Ohio, have invented certain new and usefulImprovements in Saw-Filin g Machines, whereof the following is adescription, reference being had to the accompanying drawings making apart of this specification, in which- Figure l is a front view of thesaw-iiling machine. Fig. 2 is a plan view. Fig. 3 is an end view. Fig. 4is a view of the rear side.

4 Like letters of reference refer to like parts in the several viewspresented.

The object of this invention is to facilitate the filing of saws; and itconsists in certain devices whereby the file is held in proper relationto the angle of the saw-teeth, by which means a greater uniformity inthe size and angle of the teeth is obtained than when the iling is doneby holding the file in the hand in the ordinary way.

Of the above-specified invention the following is a more full andcomplete description:

In the drawings, A B represent vtwo sections comprising the base of themachine. Said sections are secured to each other by setscrews O. Thesections form a clamp between the jawsD E, Fig. 2, of which is held thesaw F. On the top of the base or clamp is arranged a frame, consistingof the arch G and the circular base H, Figs. 1 and 2. Said frame issecured in position by one edge of the circular base passing under thegrooved projection b of section A of the clamp, as shown in Fig. 3. Theopposite side of the circular base is secured by a nut, I, in whichworks the screw J, whereby the frame is made to slide reciprocally alongthe top of the clamp. The screw referred to is operated by aratchetwheel, K, and pawl L, Fig. 3. Said pawl is pivoted to a lever, M,at the point c, whereby it is operated for actuating the screw. c, Fig.3, is a spring fixed in the upper end of the pawl,'and whereby the .pawlis made to engage the wheel K. From the crown of the arch Gr, referredto, is suspended, by the screw N, a yoke, O, Fig. 4, in which isclosely, but loosely, fitted a center-piece, P, having a slot, d, Fig.l, therein, in which is tted a slide, Q, Fig. 3. To the slide is securedthe saw-file It,

Fig. 3, by means of the arms S T. The arm S is attached to the slide bythe set-screw c, by which screw it can be adjusted thereon, whereas thearm T is rigid. U is a guide, whereby the end of the slide Q issupported and guided in operating the le. The guide works in the hangerA', depending from the arm B', projecting from the yoke O, referred to.

` The practical operation of the above machine is as follows: The saw tobe filed is secured in the jaws D E by the set-screws C, as shown inFigs. 2 and 4.. In order to adjust the file to the rake of thesaw-teeth, the center P, through which the slide Q passes, is turned inthe yoke, as indicated by the dotted lines f, Fig. 1, which, whenproperly adjusted, is secured thus by the set-screw C'. The ile is alsoadjusted transversely in its relation to the saw, for filing the bevelof the saw-teeth, by turning the yoke O in either direction, as theright or left hand teeth of the saw may require, as indicated by thedotted lines b', Fig. 2, in which position the file is held by thesetscrew N. The iile having been properly adjusted to the character ofthe saw-teeth, the operator now files them by taking hold of the handleD', and thereby pushing the iile across the saw, as would be done in theordinary way. The slide Q and the guide U will hold the file so that itshall move steadily and in the right direction for filing the tooth withwhich the le is engaged. The first tooth being flled, the next in orderis to beoperated upon. To this end the file is moved along to the nexttooth by means of the screw J, turned by the wheel and pawl K L,operated by the lever M. This will move along the nut I, and,consequently, the frame holding the le. To insure certainty anduniformity in the distance that the file shall move to engage thesawteeth is the purpose of the stop E, against which the pawl strikes.Said stop is adj usted on the plate F', according to the distance of theteeth successively to be filed. The teeth being filed upon one bevel,the position of the ile is changed to suit the uniiled bevel, asindicated by the dotted lines c', Fig. 2. In order to work the file backfrom tooth to tooth of the saw, the pawl is changed in its engagementwith the wheel by removing the pin c' from the lever and inserting it inthe hole f, so as to hold the spring on that side of the lever, whichwill cause the opposite corner of the pawl to engage the Wheel, andthereby work the screw in the opposite direction, and carry hack theframe and le along the saw.

By the use of this device for ling saws the teeth thereof will all beoi' a, uniform angle, and thus insure e more perfect Working of the sewthan when the filing is done in the ordinary Wa-y.

It is sometimes necessary to -f1le a. tooth deeper on one side than onthe other. To this end the outer end of the le can be depressed by thehanger A', which may be shortened or FRED. W. BENJAMIN. Witnesses:

A. J. WHIPPLE, SILAS WRIGHT.

